fix build error on arm due to new a_spin code

this was broken by commit ea818ea8340c13742a4f41e6077f732291aea4bc.

arch/arm/atomic.h

@@ -103,7 +103,7 @@ static inline void a_store(volatile int *p, int x)
 
 static inline void a_spin()
 {
-	__k_cas(&(int){0}, 0, 0));
+	__k_cas(0, 0, &(int){0});
 }
 
 static inline void a_crash()